Hitachi 725792 SDS+ Shank to 3-Jaws Drill Chuck Adapter-1/2-Inch-20thread for Hitachi SDS+ Rotary Hammers For use with Hitachi rotary hammers Has a 1/2-inch 20-thread Guards against energy loss Quick change connector allows for fast and easy one-handed bit changes without re-chucking Comes with a 1-year limited warranty Quick Change No Energy Loss No Weak Points